مشخصات مقاومتی بستر رسی با خصوصیات خمیری بالای تثبیت شده با سرباره کوره ذوب آهن، خاکستربادی و دیاتومیت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه صنعتی سیرجان

2 دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی سیرجان، سیرجان، ایران

3 استادیار، دانشکده مهندسی عمران، دانشگاه صنعتی سیرجان، سیرجان، ایران

10.22091/cer.2021.6858.1241

چکیده

خاک رس با خصوصیات خمیری بالا یکی از انواع خاک‌هایی است که در اکثر نقاط ایران یافت می‌شود. این خاک به‌عنوان یک خاک مسئله‌دار شناخته‌شده و جهت استفاده از این خاک در زیرساخت‌های حمل و نقل نیاز به بهسازی و اصلاح مشخصات آن است. هدف این تحقیق ارزیابی مشخصات مقاومتی خاک رس تثبیت شده با ضایعات صنعتی است که علاوه بر تثبیت خاک، به دلیل استفاده از ضایعات صنعتی دارای مزایای زیست محیطی نیز می‌باشد. در این تحقیق از سرباره کوره ذوب آهن، خاکستربادی و دیاتومیت به‌عنوان تثبیت‌کننده خاک رس استفاده‌ شده است. تثبیت با استفاده از سرباره کوره ذوب آهن، خاکستربادی و دیاتومیت با درصد‌های 10، 20 و 30 درصد وزنی خشک خاک انجام شد و نمونه‌ها در درصد رطوبت بهینه متراکم شدند. در تحقیق حاضر از آزمایش‌های تراکم و مقاومت فشاری محدودنشده (UCS) جهت مقایسه پارامترهای مقاومتی خاک قبل و بعد از تثبیت استفاده ‌شد. نتایج به دست آمده نشان دادند که سرباره به عنوان تثبیت کننده نسبت به خاکستربادی و دیاتومیت عملکرد بسیار مناسبتری داشته است. نمونه تثبیت شده با 10 درصد سرباره با رسیدن به مقاومت 16/2 مگاپاسگال نسبت به سایر نمونه‌های تثبیت شده عملکرد بهتری داشت و نمونه بهینه است. این نمونه نسبت به نمونه تثبیت نشده خاک رس 92/3 برابر افزایش مقاومت داشته است. نمونه‌های تثبیت شده با 30 درصد خاکستربادی و 30 درصد دیاتومیت نیز با رسیدن به مقاومت‌های 9/0 و 03/1 مگاپاسگالی توانستند به ترتیب نسبت به نمونه تثبیت نشده 49 و 88 درصد افزایش مقاومت از خود نشان ‌دهند.

کلیدواژه‌ها

عنوان مقاله [English]

Strength Characteristics of High Plasticity Clay Sub-grade Soil Stabilized with Ground Granulated Blast Furnas Slag, Fly-Ash and Diatomite

نویسندگان [English]

  • Kourosh Mirzaei 1
  • Ali Reza Ghanizadeh 2
  • Somayeh Bakhtiari 3
1 M.S Student, Department of Civil Engineering, Sirjan University of Technology, Sirjan
2 Associate Professor at Faculty of Civil and Environmental Engineering, Sirjan University of Technology, Sirjan, Iran.
3 Assistant Professor, Department of Civil Engineering, Sirjan University of Technology, Sirjan
چکیده [English]

High plasticity clay soil is one of the soils that can be found in most regions of Iran. This soil is known as a problematic soil and as subgrade soil for transportation infrastructures, its characteristics must be improved. The purpose of this study is to evaluate the strength characteristics of high plasticity clay soil stabilized with industrial waste, which in addition to soil stabilization, also has environmental benefits. In this research, steel furnace slag, fly ash and diatomite have been used as stabilizer agents. Stabilization was performed using with 10, 20 and 30% of stabilizer agents by dry weight of soil and samples were compacted at optimum moisture content. In the present study, compaction as well as unconfined compressive strength (UCS) were conducted to compare the strength parameters of soil before and after stabilization. The results showed that the steel furnace slag had a much better performance as a stabilizer than fly ash and diatomite. Samples stabilized with 10% of steel furnace slag with a UCS of 2.16 MPa has a better performance in comparison with other stabilized samples and is the optimum sample. This sample shows a 3.92 times increase in UCS compared to the untreated clay soil. Treated samples with 30% of fly ash and 30% of diatomite with UCS of 0.9 and 1.03 MPa, show 49% and 88% increase in UCS compared to untreated samples, respectively.

کلیدواژه‌ها [English]

  • Keywords: Clay Soil Stabilization
  • Unconfined Compressive Strength
  • Tensile Strength
  • Ground Granulate Blast Furnace Slag
  • Diato-mite

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